clean the wheel with a small wire brush. that will get rid of any buildup and expose new grit. i have one about the size of a toothbrush with fine stainless wire. stay away from a real stiff wire or it will dig in and remove more than what you want.
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Baldor part number HA6113SP.
Baldor offers a pressed steel thrust washer with a 5/8" bore, part number HA6115401SP.